Doomsday rule: Difference between revisions
Added XPL0 example.
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</pre>
=={{header|XPL0}}==
{{trans|ALGOL W}}
<syntaxhighlight lang "XPL0">
\Finds the day of the week of a date using John Conway's Doomsday rule.
\Returns the day of the week (Sunday = 0, Monday = 1,...) for the date
\ specified by CCYY, MM and DD.
function DOW ( CCYY, MM, DD );
integer CCYY, MM, DD;
integer Doomsday, AnchorDay, LeapYear, Dooms;
begin
Doomsday := rem(( \Tuesday \2
+ 5 * rem( CCYY/4 )
+ 4 * rem( CCYY/100 )
+ 6 * rem( CCYY/400 )
) / 7);
LeapYear := rem(CCYY/4) = 0 and ( rem(CCYY/100) # 0 or rem(CCYY/ 400) = 0 );
Dooms := [[4, 1, 7, 4, 2, 6, 4, 1, 5, 3, 7, 5],
[3, 7, 7, 4, 2, 6, 4, 1, 5, 3, 7, 5]];
AnchorDay := Dooms(if LeapYear then 0 else 1, MM-1);
return rem( ( Doomsday + ( DD - AnchorDay ) + 7 ) / 7);
end; \DOW
\Prints a test date and its day of the week
procedure TestDOW ( CCYY, MM, DD );
integer CCYY, MM, DD;
integer DayName;
begin
DayName := ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
"Saturday"];
IntOut(0, CCYY);
ChOut(0, ^-); IntOut(0, MM/10); IntOut(0, rem(0));
ChOut(0, ^-); IntOut(0, DD/10); IntOut(0, rem(0));
Text(0, ": "); Text(0, DayName( DOW( CCYY, MM, DD ) ));
CrLf(0);
end;
begin \task test cases
TestDOW( 1800, 1, 6 );
TestDOW( 1875, 3, 29 );
TestDOW( 1915, 12, 7 );
TestDOW( 1970, 12, 23 );
TestDOW( 2043, 5, 14 );
TestDOW( 2077, 2, 12 );
TestDOW( 2101, 4, 2 );
TestDOW( 2022, 6, 19 )
end</syntaxhighlight>
{{out}}
<pre>
1800-01-06: Monday
1875-03-29: Monday
1915-12-07: Tuesday
1970-12-23: Wednesday
2043-05-14: Thursday
2077-02-12: Friday
2101-04-02: Saturday
2022-06-19: Sunday
</pre>
=={{header|Yabasic}}==
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